Improvement in pawls and ratchets



R. r umuusou a 1.- SMITH.

Pawl and Ratchet.

Patented Jan. 26, 1875f mamih Pump :0 WA Hmc'raN D c UNITED, STATESPATENT QFFIGE.

' RALPH TOMLINSON AND JOSEPH SMITH, OF BOSTON, MASSACHUSETTS.

lMPROyEMENT IN PAWLS AND RATCHETS.

Specification forming part of Letters Patent No. 159,124, dated January26, 1875; application filed December 19, 1874.

To all whom it may concern Be it known that we. RALPH [[OMLINSON ofSutl'olk and State of Massachusetts, have.

invented a new and usefulImprovement on Sewing-Machines, of which thefollowing is a speci lication:

The invention will first be fully described, andthen pointed out in theclaim.

Figure 1 is an end elevation of the shaft and pulley, showing the pawlengaged with the ratchet for turning the shaft. Fig. 2 is an endelevation, showing the pawl adjusted for allowing the wheel to runwithout turning the shaft for winding the bobbins; and Fig. 3 is asectional elevation of Fig. 1 on the line a: w.

Similar letters of reference indicate corresponding parts.

' A is the shaft; B, the pulley; O, the ratchet; D, the pawl, and E thespring. The pulley is loose on the shaft, the ratchet is keyed to it,

and the pawl is fixed on a pivot at or about the middle, and it has aprojection, F, with relation to which and the pivot of 'the pawl thespring is so arranged that it will hold the pawl either in or out ofconnection with the ratchet, according to which way it is shifted.

shaft A, having end ratchet, of the pawl l) v and spring E, the formerhaving the projection F, as shown and described, whereby said spring mayhold the pawl either in contact with or away from the ratchet.

" RALPH TOMLINSON.

JOSEPH snrrn.

Witnesses:

ENDIX T. SWIFT, DUNCAN BRADFORD.

